[Issue 17628] formattedWrite is impure on double

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17628

Eduard Staniloiu <edi33416 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |edi33416 at gmail.com

--- Comment #3 from Eduard Staniloiu <edi33416 at gmail.com> ---
Since `pureMalloc`, `pureCalloc` and `pureFree` got accepted[0], maybe we could
do the same for `sprintf` and `snprintf`?

[0] - https://github.com/dlang/druntime/pull/1836

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